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New to Developing, need mouseover effect

I am new to learning JavaScript and I could really use some help. My boss insisted on a carousel for his homepage, so I watched a YouTube video on how to create one with JavaScript. There are a few things I want to change, however and I can't figure it out.

I pasted my code below. I really want it so that if the user HOVERS over the carousel it begins to twirl, not on the page load. How can I fix this?
Another question is when I put it on the page, it keep bleeding over the container. Is there a way I can fix this in the JS code?

I really appreciate the help. I did try to fox this myself before the post but I am too new to this to figure it out and I am really stuck.